H - Electricity – 01 – L
Patent
H - Electricity
01
L
327/3, 347/7, 31
H01L 39/06 (2006.01) G01R 33/421 (2006.01) H01L 39/08 (2006.01) G01R 33/3815 (2006.01)
Patent
CA 1202685
ABSTRACT Disclosed is a method and apparatus for providing magnetic shielding around a working volume. The apparatus includes a hollow elongated superconducting shell or cyl- inder having an elongated low magnetic pinning central portion, and two high magnetic pinning end regions. Tran- sition portions of varying magnetic pinning properties are interposed between the central and end portions. The apparatus further includes a solenoid substantially coex- tensive with and overlying the superconducting cylinder, so as to be magnetically coupled therewith. The method includes the steps passing a longitudinally directed current through the superconducting cylinder so as to depin magnetic reservoirs trapped in the cylinder. Next, a circumferentially directed current is passed through the cylinder, while a longitudinally directed current is maintained. Depinned magnetic reservoirs are moved to the end portions of the cylinder, where they are trapped.
429513
Meredith & Finlayson
United States Of America (government Of The) United States Depar
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